Mumma.of.two said:Goldfish can change colors but not that fast. My first guess would be ammonia/nitrite burns.
What size tank?
What are the ammonia, nitrite, nitrate an pH of the tank?
Any tank mates?
How long has it been set up and how was it cycled?
Jguid said:My tank cycled yesterday or atleast I think so the water turned from cloudy to clear
Andrew McFadden said:What about the nitrite, ammonia, nitrate levels? You need to know these when cycling and they are very harmful to your fish.
You might be off the charts in your 15 gallon with those fish and turtle and you MAY Not be able to keep these levels under control.
Jguid said:The turtle is in another tank